From "adamant" (in a speech by Barack Obama) to "yammer" (in Glenn Stout's introduction to Best American Sports Writing 2004), this collection of 100 words and quotations has been assembled by the editors of the American Heritage dictionaries to help you add firepower to your vocabulary. Each word is defined and given in the context of one or more quotations from such captivating public voices as Mohandas Gandhi, Nelson Mandela, Benazir Bhutto, Rachel Carson, Carl Sagan, Edward O. Wilson, Alan Greenspan, John Maynard Keynes, Adam Smith, Henry Louis Gates Jr., Ruth Simmons, James Baldwin, Bono, Eleanor Roosevelt, Garrison Keillor, Groucho Marx, and Sarah Vowell.